alamb opened a new issue, #8132:
URL: https://github.com/apache/arrow-rs/issues/8132
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
One of the goals of adding `Variant` support to the parquet crate is to not
requiring users to compile and bloat their binary size unless they want this
functionality. This means that we have added all actual code and
functionality
in different crates: `parquet_variant`, `parquet_variant_compute`, etc.
However at the moment, users who want to use the `Variant` functionality
need to
add the `parquet_variant` crate to their `Cargo.toml`. This has several
downsides:
1. It will be more complicated to use the `Variant` functionality for users
2. There is no way to provide end to end examples of reading and writing
`Variant` data in either
the `parquet` or `parquet_variant` crates
3. The end to end tests for reading parquet files with `Variant` data need
to add both
the `parquet` and `parquet_variant` crates to their `Cargo.toml`
**Describe the solution you'd like**
I would like an easy way to for users to find the Variant feature, and see
examples of how to use it
**Describe alternatives you've considered**
Thus, I propose we add a `variant` feature to the `parquet` crate that
re-exports the `parquet_variant` and `parquet_variant_compute` crates. This
way
users can add the `parquet` crate with the `variant` feature to their
`Cargo.toml` and get all the functionality.
This is similar to the `arrow` feature in the `parquet` crate that enables
arrow
functionality for those users who want it but does not require all users to
depend on the `arrow` crate.
An alternate strategy would be to require users to explicitly import the
`parquet` and `parquet_variant` crates in their `Cargo.toml` to use the
variant
functionality. You can see an example of how this might look in
* https://github.com/apache/arrow-rs/pull/8129
**Additional context**
This first came up in the context of adding an integration test for the
parquet files here:
- https://github.com/apache/arrow-rs/pull/8104
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